Hone



April 29, 1947. \H. c. SATTERTHWAITE 2 Sheets-Sheet 1 HONE INVENTOR.

Filed Jan. 17, 1945 April 29, 194 7.

H. C. SATTERTHWAITE HONE Filed Jan. 17, 1945 2 Sheets-Sheet 2 Illlvl .i ll ll? ll I IIIIEVIA o Patented Apr. 29, 1947 UNITED STATES PATENT OFFICE HONE Harry G. Satterthwaite, Detroit, Mich.

Application January 17?, 1945, Serial No. 573,149

13 Claims. 1

This invention relates to hones employed for removing material by an abrading action from the surfaces of cylindrical bores.

Objects of the invention include the provision of a novel form of hone including a tapered mandrel and abrading elements mounted thereon, the abrading elements being shiftable longitudinally with respect to the mandrel so as to vary the effective diameter of the hone, and in which a novel form of connection is provided between the vmandrel and the abrading element serving to maintain the abrading elements in position under the effects of centrifugal force during operation; the provision of a hone having a novel form of mechanism for effecting relative movement between the abrading elements and the mandrel longitudinally of the latter; the provision of a hone including a novel form of connection between the abrading elements and means directly connected thereto for imparting relative longitudinal movement between the abrading elements and the supporting mandrel; and the provision of a novel form of abrading element for a hone of the character described.

The above being among the objects of the present invention, the same consists in certain novel features of construction and combinations of parts to be hereinafter described with reference to the accompanying drawings, and then claimed, having the above and other objects in view.

In the accompanying drawings, which illustrate suitable embodiments of the present invention and in which like numerals refer to like parts throughout the several different views,

Fig. 1 is a fragmentary, partially broken, partially side elevational View of honing apparatus embodying the present invention; 7

Fig. 2 is an enlarged, partially broken, partially sectioned, side elevational view of the hone shown in Fig. 1;

Fig. 3 is an end elevational view of the hone shown in the precedin figures taken in the direction of the arrows 33 of Fig. 2;

Fig. 4 is an enlarged, transverse, sectional view taken on the line 4-4 of Fig. 2;

Fig. 5 is an enlarged, fragmentary, sectional view taken axially through the outer end of the mandrel and the abrading elements thereon as on the line 5-5 of Fig. 4;

Fig. 6 is an enlarged, fragmentary, transverse, sectional view taken on the line 6-4: of Fig. 2;

Fig. 7 is an enlarged, transverse, sectional View taken on the line l--'l of Fig. 2;

Fig, 8 is an enlarged end view of the mandrel taken looking in the direction of the arrows 8-8 of Fig.2; and

Fig. 9 is a fragmentary side elevational view illustrating the application of the present invention to a hone having abrading elements arranged in tandem or multiples.

The present invention particularly relates to that class of hones adapted for operating upon relatively small bores, and for this reason it is not possible to include the relatively intricate mechanism that it is possible to employin hones designed to operate upon relatively large bores as, for instance, the bores of engine cylinders or the like. Hones of the type to which the present invention is related must therefore be relatively simple in construction, but at the same time, in order to be commercial they must be constructed to efliciently operate with a minimum of trouble.

One of the main problems in connection with the type of hone herein under consideration is the means employed for holding the abrading elements to the mandrel so that they will'not become disconnected during rotation of the hone and particularly when not operatively engaged in a bore to be finished thereby. The hone of the present invention has been particularly designedwith this feature in mind, as well as to provide a simple and economical means and mechanism for adjusting the hone to compensate for wear of the abrading elements thereof.

Referring now to the accompanying drawings, and particularly to the construction illustrated in Figs. 1 to 8 inclusive, it will be noted that the hone in question comprises a mandrel indicated generally at In having a generally cylindrical rear end portion l2 and an outer or forward, tapered portion indicated generally at l4. Preferably the mandrel I0 is formed from a cylindrical piece of stock and the end portion l4 formed by machining away opposite sides thereof to provide a pair of oppositely disposed, fiat faces l6 which, as perhaps best brought out in Fig. 4, in section, are arranged in parallel chordlike relation, and each extends from one side of the mandrel to but short of the opposite side thereof where it is bounded by an outwardly eXtending wall [8 which extends out through the otherwise cylindrical surface of the mandrel. Each face I6 is, of course, disposed longitudinally at the same angle to the axis of the mandrel Ill to obtain the wedge-like character of the end l4 shown. It will be observed that the walls iii are each positioned at the trailing edge of their corresponding surfaces It with respect to the direction of rotation of the mandrel, indicated in Figs. 3 and 4 by the arrows 2E3. The walls [8 are notperpendicular to the planes of the corresponding walls IE but are inclined so that their outer ends overlie the junction with their corresponding wall, and, while they may be either fiat or curved, they are preferably curved as illustrated, but, in either case, so as to provide a more or less hooklike engagement with respect to the co-operating abrading elements to be received thereby.

It is the surfaces It which taper toward one another in extending from the portion l2 toward of the surfaces l5 and being of a maximum height Y and, therefore, provided with a maximum amount of overlie or hook with respect to the line of junction between them and the corresponding surfaces It at their axially outer ends. The distance from the line of junction of each surface I8 with its corresponding surface it from a plane including the axis of the mandrel and perpendicular to the surfaces it remains constant over the length of the portion M so that each pair of surfaces it and It may be formed by a properly contoured milling cutter by one pass of the same over the length of the portion l4.

Also as best brought out in Fig. 4, a slot 22 is provided in the portion M and extending downwardly from each surface IE on that side of the center thereof opposite the wall 18, and each slot 22 is inclined outwardly away from the center of its corresponding surface [5 in extendin downwardly therefrom. Th slots 22 open onto their corresponding surfaces It at a constant distance from the line of junction of such surface and the co-operating wall it and extend from the rear or inner end of the portion 5% to a point close to, but inwardly spaced from, the outer end of the portion l4 as best brought out in Fig. 5. This last feature is so that the slot 22 will not cut the end of the mandrel into separated parts but will leave it tied together.

An abrasive or abrading member, indicated generally at 24, is received by each co-operating pair of surfaces It and iii, the inner surfaces of each abrading member being formed to a shape and contour complementary to the surfaces 56 and 18 so as to have substantially surface engagement therewith. The radially outer surfaces of each member 24 are formed as part of a cylindrical surface, the longitudinally extending lines of which are parallel to the axis of the hone, and when the abrading members 24 are adjusted to the proper axial position on the outer or wedge portion l4, such outer surfaces of the abrading members are concentric with the axis of the hone.

Each abrasive or abrading member 24 comprises preferably a metal backing member 28 adapted to lie in fiat, contacting relationship with the corresponding surface It and provided with an upstanding flange along one edge, the outer face of which is complementary to the corresponding surface N3 of the mandrel and which lies thereagainst. Intermediate its ends, each backing member 25 is provided with a downwardly and outwardly struck tongue 30 arranged at substantially the same angle with respect to the surface is as the groove 22 and is received within the corresponding such groove. Each abrading member 24 further includes an abrasive element 32 which is fixed to its corresponding backing member 26 by any suitable or conventional means, as for instance, by suitable cement or the like.

As an added means for securing each abrasive element 32 to its corresponding backing member 26, and particularly to hold it against movement axially of the hone in an outward direction, the outer end of each abrasive element 32, as best brought out in Fig. 5, is provided with a notch 34, the radially inner face of which is inclined rearwardly from its radially inner edge, and the forward end of each corresponding backing member 26 is provided with a tongue 36 which is bent into flat, contacting engagement with such inclined face ofthe corresponding notch 34. Preferably the notches 34 are of greater axial depth than the thickness of the tongue 36 so that the backing members 26 lie in axially spaced relation rearwardly of the forward or outer end face of the abrasive elements, this feature permitting the abrasive elements to be passed axially into contact with the blind end of a bore, or against the shoulder in a bore, of a workpiece being operated upon.

The backing member 26 may be formed from sheet metal or may be die-cast from suitable metal or other material suitable for the purpose. In any event, the flanges 28 and 39 ar preferably so spaced that, when applied to the mandrel,

the flange 3!! is pressed in a direction to urge the flange 28 thereof against the corresponding surface l8 of the mandrel and hold it firmly in contact therewith. At the same time, because of the angularity of the flange 3B and of its associated groove 22, this causes a tension to be set up between the flange and the groove tending to pull the opposite side of the corresponding abrasive member 24 downwardly into flat contacting relationship with respect to the surface l6. Because of the hooklike characteristics of the surface it! and the described angularity of the slots 22 and the co-operating flanges 3B, eachabrading member 2A is firmly held to the mandrel so as to resist the centrifugal force to which it is subjected during rotation of the hone, particularly when the hone is not actively engaged in the bore. Furthermore, and particularly where the flange or tongue 39 of each abrading member 24 is so spaced with respect to the corresponding flange 28 thereof as to be placed under a tension tending to urge the flange 28 against the corresponding surface l8 of the mandrel, each abrasive member 24 is constantly urged into firm contacting relationship with respect to the corresponding surfaces I6 and iii of the bone. This last feature has the additional advantage of eliminating any space between the abrading member and the mandrel into which particles of abrasive worn from the abrasive elements 32 in service may find their way, thus not only possibly interfering with the proper operation of the hone, but through their abrading action fostering early destruction of the hone. The flanges 30 may be readily bent to obtain the above-described tension if not originally in a position resulting in this effect.

It will be observed from the arrows 2t illustrated in Figs. 3 and 4 and which illustrate the normal direction of rotation of the hone, that the surfaces It act to take the primary driving force between them and the mandrel l0 necessary to rotate the abrading members 24 in a bore, and that the resistance to turning the abrading members 24 in a bore reacting through the surfaces is act in a direction tending to pull the abrading members downwardly against the corresponding surfaces I 6. This effect supplements the action of the flanges 3B acting in the same direction.

It will be understood from the above that in practice the abrading members 24 are mounted against relative axial movement on the mandrel ID, that the mandrel is rotated and relative reciprocation is effected between the work and the hone while the abrasive members 24 are received within a bore to be operated on thereby. Under such conditions, it will be appreciated that the abrading members 2 1 are positioned axially of the wedgelike'. end l4 of the mandrel It so that their combined effective diameter is substantially that of the bore being operated upon, and that as the abrasive elements 32 wear because of contact with the work, the abrading members 24 are shifted longitudinally on the end 14 to increase the effective combined diameter thereof and thus compensate for such wear. In accordance with the broader aspects of the present invention, any suitable means may be. provided for shifting the position of the abrading members 24 axially out of the mandrel I0. However, in accordance with a more limited phase of the present invention, a novel form of means'is provided for this purpose and will now be described.

The mandrel I is provided with a pair of diametrically opposite grooves 40 formedftherein in parallel relation to the axis thereof and the bottom surfaces of which are parallel to the aXis of the mandrel. As best brought out in Fig. 2' the grooves 40 may extend from a point substantially midway the length of the cylindrical portion l2 of the mandrel to some suitable point intermediate the length of the tapered portion l4 thereof. Each groove lll is so positioned angularly of the mandrel that it lies centrally of one of the surfaces It on the tapered end of the mandrel. While the grooves 40 may be of any suitable cross-sectional configuration, preferably they are of rectangular cross-sectional configuration as best brought out in Fig. 7 and in such case in each thereof is received a preferably rectangularly sectioned bar 42.

As best brought out in Figs. 2an'd 5, and particularly the latter view, the central flat portion of each backing member 26 is extended axially rearwardly beyond the end of the corresponding abrasive element 32, as indicated at 44, and each portion 44 in line with the corresponding groove 40 is formed to provide an integral downwardly projecting U-shaped strap'lportion 46 which fits, or at least is slidably received, within such corresponding groove 40. A similar strap 48 is preferably formed in the baseof each backingmember 26 within the length of the corresponding abrasive element 32 as brought out in Fig. in particular. The straps -46 and48 are preferably formed by transversely slitting the backing member over its central portion over a width corresponding with the desired width of the strap and at points spaced axially of the backing member corresponding to the desired width ofthe strap, and then drawing thepart within the split downwardly to form such strap.

The forward ends of the bars 42 have their, outer surfaces tapered into complementary angularity to that of the inner faces of the abrading members 24 and are received against the underfacesof the corresponding backing members 26 and are projected through the two corresponding straps 46 and 48 thereof until they are snugly received therein and against the under-face of the corresponding backing member 26, in which position they are fixed to the corresponding backing member 26. Preferably, and in accordance with a more limited phase of the present invention, in order to lock each bar 42 to its corresponding backing member 26, each bar 42 in line with the forward andrearward edge of the opening provided therein by the formation of the strap 46 is inwardly notched, as brought out in Fig. 5, and the metal of the corresponding extension 44 at the corresponding'edge of such opening'is driven down into such notch as indicatedat 50. The notches are preferably angularly disposed with respect to the surface of the bars 42 as shOWn so that the downwardly bent portions 50 serve in the nature of ratchet teeth locking each bar 42 to its corresponding abrading member 32 against movement in either axial direction. This gives a construction, which securely and rigidly locks each abrading member 32 to its corresponding bar -42 and yet provides one which permits relatively ready removal of the bars 42 from the abrasive members when replacement of the abrasive members because of wear becomes necessary, and permits ready securement of the bars to the new wear members where thus substituted for the old. It might be noted at this point that preferably the extensions 44 of the backing member 26 are formed to present outwardly projecting longitudinally extending ribs or beads 52 on either side of the hole formed in each backing member by provision of the corresponding strap 46, thereby to reinforce and rigidify the portion 44 over the length of such hole.

It will be appreciated that the bars 42 may, in the broader aspects of the invention, be connected to any suitable form of actuating or control means for controlling the relative position thereof axially of the mandrel l0. However, the

means provided in accordance with the present invention is preferable and is brought out in Fig. 2. As indicated in Fig. 2 the rear or cylindrical portion I2 of the mandrel I0 is axially slidably received within a sleeve member 60, and the forward end of such sleeve member BI] is provided with a diametrically disposed slot 62 extending completely across the same. The slot 62 is of a cross-sectional size and configuration substantially equal to that of the bar members 42, and the rear ends of the bar members 42 are bent radially outwardly as at 64, and the end 64 of each bar member 42 is received in that end of the slot 62 in the corresponding side of the centerof the mandrel. A cupshaped cap member 66 having an end wall which is apertured to receive'the end l2 of the mandrel is threaded on the forward end of the sleeve 60 as indicated in Fig. 2 so that its end wall confines the outwardly turned ends 64 of the bars 42 against relative axial movement with respect to the sleeve 60, but at the same time permits radial movement of the ends 64 in the grooves 62. It will be appreciated that this last feature is necessary, inasmuch as the bar members 42 move radially with respect to the axis of the mandrel as the abrading members 24 are shifted. axially of the wedge l4 of the mandrel. Thus, by the construction described, if the mandrel Illv is shifted axially with respect to the sleeve 60, relative axial movement is caused between the abrading members 24 and the mandrel which relative movement afiects either relative expansion or contraction of the abrading members 24, as may be desired.

In order to enable control of the relative axial shifting movement of the mandrel with respect to the sleeve 60 to be had and provide a means for rotating-the hone, the sleeve 60, as brought out in Fig. 1, is in turn received in a sleeve Til. The sleeve 10 isshouldered as at 1-2, and the sleeve 60 is received against such shoulder and securely clamped thereagainst by means of a set' screw such as 14 disposed at an angle to the axis of the mandrel and the sleeve 60 in a direction such that upon tightening the set screw '14, it not relative rotation with respect to the sleeves 60 and N1, the bore of the sleeve 60 is provided-with a longitudinally extending keyway l6, and the mandrel H] is provided with a key 18 secured against movement therein and slidably received within the keyway 25. Where it is desired to rotate the home, then, of course the sleeve IE1 is mounted for rotation, as by means of a member'Hl and suitably driven, and where it is desired not only to rotate the hone, but also to reciprocate it axially, then the sleeve is not only mounted for rotation in, but for axial reciprocation with, the member 19 as well. Any suitable or conventional means may be provided for rotating the sleeve l9 and/or axially reciprocating the member 19.

It is ordinarily undesirable to make the mandrel H of such length that it will project through the length of the sleeve TE and its co-operating parts, and in such case in order to enable relative axial movement of the mandrel H1 and the sleeve 6!! to be controlled, it is necessary to provide an axial extension on the rear end of the mandrel it. While this maybe accomplished in any suitable or conventional manner, in the pres-r ent case the rear end of the mandrel, as best brought out in Fig. 2, is annularly grooved as at 80 and is providedwith a head 82 rearwardly beyond such groove. This head $2, as best brought out in Fig. 8, is originally circular in section and concentric with the axis of the mandrel it, and its opposite sides are flattened off as at 84. A concentric extension 86, as brought out in Fig. l, is provided for, the mandrel H] and ispreferably of the same diameter as shown. On its' forward end, it is provided with a so-called locking nose 88; which comprises a, cup-shaped member fitting over the same and fixed against relative movement to it, as by means of a pin 89 or other suitable means. The bottom or end wall of the locking nose 88 is centrally provided with an opening there-through of the same contour as the head 82, or optionally with a cross-slot 90 of slightly greater width than the width across the flats 85 of the head 82 so as to be capable of receiving the head 82 therethrough. This slotted bottom wall of the nosepiece 88 is of substantially the same thickness as the width of the slot 80, so that the head 82 may be projected through the hole orslot 98, and then turned, through 90, for instance, thereby to lock the mandrel lG'to the extension 85 for equal axial movement. Means, as, for instance, a key 92 fixed in the extension 85, working in a keyway 94 in the sleeve member '70, serves to releasably secure the mandrel i0 and extension 86 against relative rotation in service, and, therefore, in axially connected relation.

While any suitable means may be provided for efiecting relative reciprocation between the mandrel l0 and sleeve TB in order to control the effective diameter of the operative end of the hone, one form of such mechanism is shown more or less diagrammatically and isas follows. The rear end of the extension 86 is provided with an annularly grooved collar I95} fixed thereto. The bifurcated end of a lever I02 bridges the opposite sides of the collar I 90, and each arm on such bifurcated end is provided with an inwardly projecting pin HM which is received within the groove of the collar IUD. The lever W2 is pivoted at I06 to a suitable part held in axially fixed relation with respect to the sleeve 19, as, for instance, the member '19, this being necessary so that in event the wholeassembly is reciprocated, such reciprocation will not; cause relative-expansion andcontraction of the hone. It will be appreciated thatby rocking the lever I02 about its pivot pin I06 the relativeaxialposition of the mandrel with respect to the abrading elements 24 will be effected, thereby to effect anincrease or a decrease of the effective diameter of the hone, depending upon the direction of reciprocation.

In honin long holes it is generally not advisable to attempt to use a short hone, particularly where the hone is to be utilized in straightening up thebore. At the same time, it is impractical in such case to makethe abrasive members such as 24 of relatively great length, particularly for small bores, for in such case the angularity of the wedge-shaped end of the mandrel is necessarily so small that the effective life of an abrasive member is so short as to beimpractical. The practical way to provide a long hone in such cases is to provide one with a plurality of pairs of honing members arranged in tandem thereon. A novel means of connecting such abrading members for simultaneous expansive and/or contractive movement is provided in accordance with a further phase of the present invention and is shown in Fig. 9.

Referring to Fig. 9 it will be noted that the mandrel there shown up to a point indicated at H0 is identical to the mandrel heretofore described, and corresponding features thereof are indicated by the same numerals, except that such numerals bear a prime mark, Thi portion of the mandrel, therefore, does not require to bevv redescribed. The mandrel H1 is axially extended beyond the end of the mandrel In as previously described to such extent as is necessary to accommodate the desired additional numbers of pairs of 'abrading members. It will be appreciated that it may be extended to receive one additional pair of abrading members, two additional pairs of abrading members or any desired number of pairs of abrading members. In Fig. 9

it is shown as extended sufliciently to accommo date two additional pairs of abrading members in tandem with the first or inner set ofabrading members. Accordingly it is-shown as being provided on each side thereof corresponding with each of the inclined surfaces I6 with additional inclined surfaces Mia and lGb in axially spaced,

relation with respect to each other and to'the surface 5', and it will be understood that each of the surfaces I61; and I617 are bounded at one side thereof by surface corresponding to the surfaces l8 first described and each is provided with grooves therein corresponding with the grooves 22 previouslydescribed.

The abrading elements 24 which are received on the surfaces I6 may be identical to the abrading elements 24 first described and connected to the bars 42' in identically the same manner'as first described, with the exception only that the forward end of the backing member 26' therefor is extended as at H2 and inclined radially outwardly and formed with a transverse bifurcated or yoked eye 4 at its free end. The mandrel 10' between the siu'faces l6 and Him is suitably cut away to accommodate the end H2 and eye I I4, and it, is similarly cut away betweenthe surfaces 16a and l6b. The backing member 26a for each of the next outward abrading members 24a, may be identical to the backing member 26 the opposite arms of the bifurcated eye H4 and i is connected thereto by means of-apin 116, thus serving to interconnect the abrading elements 24' and 24a for simultaneous axial movement received on the mandrel in the identical manner,

with the exception that like the backing members 26a, they are devoid of any loops such as 46 and 48 in the first-described construction and their.

rear ends are extended and provided with eyes co-operating with the forward bifurcated eyes 4a of the corresponding backing members 26a and secured thereto by corresponding pins 6b.

' scribed.

It will be appreciated from the above that from the construction illustrated in Fig. 9, the mandrel is provided with a series of inclined or wedgelike portions arranged in tandem to each other and each of the same angularity, and that the abrasive members are applied to each of the wedgelike portions in substantially the same manner as the abrasive members first described and are therefore mounted thereon against radial movement under the influence of centrifugal force, but may be shifted longitudinally thereof to vary the effective diameter thereof. Furthermore, it; will be appreciated that in view of the fact that all of the pairs of abrasive members are secured together for equal and simultaneous movement axially of the hone, the effective diameter of all pairs of abrasive members may becontrolled in identically the same manner asin the construction first described. It may also be noted that the additional abrasive membersmay be removed from the mandrel for the purpose of replacement or repair by simply driving out the pins I I6 and llfia which thereby disconnects the abrasive members from one another.

Having thus described my invention,.what I claim by Letters Patent is:

1. In a honing device, in combination, a mandrel having a pair of fiat surfaces arranged on opposite sides of the longitudinal axis thereof and both equally inclined, to said axis in the same direction to form a wedge, a wall boundin the angularly corresponding edge of eachof said surfaces and providing a surface overhanging the line of junction between it and the corresponding first-mentioned surface, said mandrel being provided with a longitudinally extending groove therein in association with each of the first-mentioned surfaces, each said groove opening onto the corresponding first-mentioned surface in parallelism to the line of junction Of said corresponding first-mentioned surface and the corresponding of said second-mentioned surfaces and extending from its point of opening onto said corresponding. first-mentioned surface at an inclination to such surface away from the corresponding second-mentioned surface, an abrading abrading member received in the corresponding said groove. a r I 2. In a honing device, in combination, a man- 7 drel having a pair of flat surfaces arranged on opposite sides of the-longitudinal axis thereof and bothequally inclined to said axis in the same "direction to form a wedge, a wall bounding the angularly corresponding edge of each of said surfacesandproviding a surface overhanging the line of junction between it and the corresponding first-mentioned surface, said mandrel being provided with a longitudinally extending groove therein in association with each of the first-mentioned surfaces, each said groove opening onto the corresponding first-mentioned surface in parallelism to the line of junction of said corresponding first-mentioned surface and the corresponding of said second-mentioned surfaces and extending from its point of opening onto said corresponding first-mentioned surface at an inclination to such surface away from the corresponding second-mentioned surface, an abrading member having surfaces complementary to each co-operatingv fi st and second-mentioned surfaces and receiving in complementary relation with respect thereto, and a projection on each said-abrading member received in the corresponding said groove, said projections being resilient and bearing against that face of the corresponding said groove opposite the corresponding second-mentioned surfaces whereby to resiliently urge said abrading membersagainst both said cooperating surfaces. I

3. In a honing device, in combination, a mandrel having a pair of flat surfaces arranged on opposite sides of the longitudinal axis thereof and both equally inclined to said axis in the same direction to form a wedge, a wall bounding the angularly corresponding edge of I each of said surfaces transversely curved on its innerside to provide a curved surface extending into ove r hanging relation with respect to the j lmion between it and the corresponding first-mentioned surface, said mandrel being provided with alongitudinally extending-groove therein in association with each of the first-mentioned surfaces, each said groove opening onto the corresponding first-mentioned surface in parallelism to the line of junction of said corresponding first-mentioned surface and the corresponding of said secondmentioned surfaces and extending from its point of opening onto said corresponding first-mentioned surface at an inclination to such surface away from the corresponding second-mentioned surface, an fabrading member having surfaces complementary to each co-operating first and second-mentioned surfaces and receiving in complementary relation with respect thereto, and a projection on each said abrading member received in the corresponding said groove.

.4. In a. honing device, in combination, a man drel having a pair of flat surfaces arranged-on opposite 'sides of the longitudinal axis thereof and both equally inclined to the axis in the same general direction to form a wedge, an abrading responding of said grooves, and a rod received in each of said grooves projecting into the loop of the 'corresponding abrading member and'se 'cured against relative longitudinal movement and both equally inclined to the axis in the same general direction to form a wedge, an abrading member received on each of 'said surfaces, said mandrel provided with a groove in opposite sides thereof in alignment with said surfaces and each extending into intersecting relationship with respect to the corresponding of said surfaces, 'each of said abrading members being provided on its inner surface with a loop projecting into the corresponding of said grooves, a rod received in each of saidgrooves projecting into the loop of the corresponding abrading member, each of said rods having-a recess therein, and portions offsaid loopsbeing displaced into said recesses whereby to lock said abrading member against "relative longitudinal movement with respect to said rods. 7

6. In a honing device, in combination, a man- 'drel having-a pair of fiat surfaces arranged on opposite sides of the longitudinal axis thereof and both equally inclined to the axis in the same general direction to form a wedge, an abrading memberreceived On eachof said surfaces, said mandrel provided with a groove in opposite sides thereof in alignment with said surfaces "and each extending into intersecting relationship with respect to the corresponding of said surfaces, each of said abrading members being provided on its inner surface with a loop projecting into the corresponding-of said grooves and having an opening above said loop, a rod received in each of said'grooves each projectinginto the loop of the corresponding abrading member, each of said rods having a notch therein in approximate alignnient with th axially forward edge-of said opening "and a notch therein in approximate 'alignmerit-with the axially rearward edge of said opening; and the material of said loops at said'edges of said openingsbeing displaced-into the correresponding said notches whereby to look said abrading members to their'corresponding said rods. i

I n a honingdevice, in combination, a mandrel having a pair of fiat surfaces arranged'on opposite sides of the longitudinal axis thereof andfboth equally inclined to the axis in the same general direction to form a Wedge, an abrading memberreceivedon each of said surfaces, said mandrel provided with a groove in opposite sides thereof in alignment with said surfaces and each extending into intersecting relationship with respect to the corresponding of said surfaces, each of'said abrading members comprising an abrading element and a metal backing member therefor projecting rearwardly therebeyond, the rearwardly' projecting portion of each of said backing members being provided on its inner surface with a loop projecting into the corresponding of said- "grooves and an opening therein above said loop, longitudinally extending ribs formed ineach rearwardly projecting portion of said backing members on each side of said opening therein, and means locking each of said abrading members to its'corresponding said rod against relative axial movement with respect thereto. 8. In a honing device, in combination, a mandrel having a tapered end portion, abrading elements received on said tapered end portion and adapted for relative movement longitudinally thereof to control the'eifective diameter of said device, a sleeve member nonrotatably but axially slidably receiving the opposite end of said mandrel therein, means interconnecting 'said abrading members and said sleeve for maintaining said abrading members at a fixed distance with respect to said sleeve, the last-mentioned end of said mandrel having a noncircular head formed thereon, and an extension for said mandrel comprising a member axially shiftable therewith having an opening in one end thereof of a contour to slidab-ly receive said head therein and a shoulder axially inwardly of said opening cooperating Withsaid head upon relative turning movement between said mandrel and said extension after said head has been received in said opening operable to releasably lock said mandrel against withdrawal'from said extension.

9. In a honing device, in combination, a mandrel having a tapered end portion, abrading elements received on said tapered end portion and adapted for relative movement longitudinally therefor'to control the effective diameter of said device, a sleeve member nonrotatably but axially slidably receiving the opposite end of said mandrel therein, means interconnecting said abrading members and said sleeve for maintaining said abrading members at a fixed distance with respect to said sleeve, the last-mentioned end of said mandrel having a noncircular head connected thereto by a neck portion of less crosssectional area than said head, a mandrel extension comprising a bar axially aligned with said mandrel, a cupshaped member fixed to that end of said bar opposed to said mandrel and arranged with its end wall'in spaced relation with respect to thecorresponding end of said extension, said end wall having an opening therein of a contour to receive said head therethrough and being of a thickness substantially equivalent to the length of said neck, said head being inserted through said opening and relatively turned with respect to its entering position w'nereby to lock said head against relative axial movement to said cupshaped member.

10. Ina honing device, in combination, a mandrelhaving a tapered end portion,-abrading elements received on said tapered end portion and adjustable longitudinally of said mandrel thereon whereby to vary the efiective diameter of said honing device, a sleeve axially slidably receiving the opposite end of said mandrelutherein, means co-operating between said mandrel andrsleeve maintaining the same against relative rotation with respect to each, other, means operativel'y connecting said abrading elements and'said sleeve maintaining said abrading elements at a constant distance from said sleeve, a rotatable member having a bore therein provided with a shoulder, said sleeve being relatively closely received in said last-mentioned member, and means cooperating between said last-mentioned member and said sleeve serving to simultaneously maintain said sleeve against relative rotation with respect to said last-mentioned member and in abutting relationship with respect to said shoulder.

11. In a honing device, in combination, a mandrel having a tapered end portion, abrading elements received on said tapered end portion and adjustable longitudinally of said mandrel thereon whereby to vary the effective diameter of said honing device, a sleeve axially slid'ably receiving the opposite endof said mandrel therein, means co-operati-ng between said mandrel and sleeve maintaining the same against relative rotation with respect to each other, means operatively connecting said abrading elements and said sleeve maintaining said abrading elements at a constant distance from said sleeve, a rotatable member having a bore therein provided with a shoulder, said sleeve being relatively closely received in said last-mentioned member, means co -operating between said last-mentioned member and said sleeve serving to simultaneously maintain said sleeve against relative rotation with respect to said last-mentioned member and in abutting relationship with respect to said shoulder, a mandrel extension received by said last-mentioned member in concentric relation with respect to said mandrel, the opposed ends of said extension and said mandrel being formed for axial locking relation with respect to each other when in one relative position of angular relation with respect to each other and axially disengageable from each other when in another angular position with respect to each other, and means cooperating between said extension and saidlastmentioned member releasably maintaining said extension in the first-mentioned angular position.

12. In a honing device, in combination, a mandrel having a plurality of axially spaced pairs of fiat surfaces arranged on opposite sides of the longitudinal axis thereof with both surfaces of each Of said pairs equally inclined to the axis of said mandrel in the same direction to form a wedge, an abrading member received on each of said surfaces, each of said abrading members comprising an abrasive element and backing member secured thereto, the backing member of each of said abrading members positioned axially rearwardly of the outermost pair of said abrading members extending forwardly of its corresponding abrasive elements and the backing member of each of said abrading members outwardly of the axially inner pair of said abrading members being provided with an extension projecting forwardly of the corresponding of said abrading elements, said extensions terminating in eyes, and means releasably interconnecting each said rearward extension and the said forward extension 14 of the next adjacent abrading member located axially rearwardly therefrom on the same side of said mandrel, whereby to interconnect all of said abrading members on the same side of said mandrel for equal movement axially of said mandrel.

13. In a honing device, in combination, a mandrel having a plurality of axially spaced pairs of flat surfaces arranged on opposite sides of the longitudinal axis thereof with both surfaces of each of said pairs equally inclined to the axis of said mandrel in the same direction to form a wedge, an abrading member received on each of said surfaces, each of said abrading members comprising an abrasive element and backing member secured thereto, the backing member of each of said abrading members positioned axially rearwardly of the outermost pair of said abrading members extending forwardly of its corresponding abrasive elements and the backing member of each of said abrading members outwardly of the axially inner pair of said abrading members being provided with an extension projecting forwardly of the corresponding of said abrading elements, said extensions terminating in eyes, and pin means passing through the eyes of each rearward extension and through the eye of the forward extension of the next adjacent abrading member located axially rearwardly therefrom on the same side of said mandrel whereby to interconnect all of said abrading members on the same side of said mandrel for equal movement axially of said mandrel.

HARRY C. SATTERTHWAITE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,354,890 Staples Aug. 1, 1944 2,336,043 Staples Dec. 7, 1943 2,349,994 Snader May 30, 1944 2,349,995 Archer May 30, 1944 2,350,969 Sunnen June 6, 1944 

